Question

【題目】If the population of the Earth keeps on 【1】 (increase) at its present rate, there will 【2】 (eventual) not be enough resources left to support life on the planet. By the middle of the 21st century, if present trends continue, we 【3】 (use) up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on Earth will make it 【4】 (necessity) for us to look for open space somewhere else. But 【5】 of the other planets in our solar system are capable of supporting life at present. One possible solution to the problem, 【6】 , has recently been suggested by an American scientist, Professor Carl Sagan. Sagan believes that 【7】 the Earth’s resources are completely 【8】 (exhaust), it will be possible to change the atmosphere of Venus and 【9】 create a new world almost as large as the Earth itself. The difficulty is that Venus is much hotter than the Earth. 【10】 , there is only a tiny amount of water there.

Answer 1

【答案】

【1】increasing

【2】eventually

【3】will have used

【4】necessary

【5】none

【6】however

【7】before

【8】exhausted

【9】therefore

【10】Besides

【解析】

試題分析：如果地球上的人口持續(xù)增長，那么地球上的資源就不能支持那么多的人生活了。有教授認(rèn)為我們應(yīng)該改造金星上的空氣來制造一個(gè)和地球差不多的生存環(huán)境以供后世之人的需求。

【1】increasing 考查名動(dòng)詞。Keep on doing sth繼續(xù)做某事，用increasing。

【2】eventually考查副詞。最終會(huì)，修飾形容詞enough用副詞，用eventually。

【3】will have used考查時(shí)態(tài)。前面if present trends continue是主將從現(xiàn)，主句用將來時(shí)，我們將會(huì)用完，use up用完，耗盡，用will have used。

【4】necessary考查形容詞。Make sth necessary某事是必要的，用necessary。

【5】none考查代詞。根據(jù)句意 are capable of supporting life at present. 可知沒有別的星球是完全適合人類生存的，用none。

【6】however考查連詞。與上文的沒有一個(gè)別的星球適合人類生存是轉(zhuǎn)折關(guān)系，此句提到了一個(gè)可以供人生存的星球，用however。

【7】before考查連詞。在地球的資源都被人用完之前，用before。

【8】exhausted考查形容詞。耗盡，are 表示被動(dòng)語態(tài)，資源是被人耗盡的，用exhausted。

【9】therefore考查連詞。表示結(jié)果，改變金星的大氣層，這樣我們才能創(chuàng)造一個(gè)和地球一樣適合人生存的環(huán)境，用therefore。

【10】Besides考查連詞。另外，金星上只有一點(diǎn)水，與上句是承接關(guān)系，用Besides。